Re: [monit] problem cpu usage

[Martin Pala]

Hi,

monit was set to monitor cpu usage - it triggers the alert when the  
watermark is reached, but it doesn't analyze itself which process is  
responsible for the load.

You can hook easily script which will be triggered by high CPU load  
and which will collect the informations during the peek.

For example let's create script like this:


/tmp/monit_top.sh:
--8<--
#!/bin/sh

exec 1>/tmp/monit_top
exec 2>>/tmp/monit_top.out

echo $$ > /tmp/monit_top.pid

while true
do
        uptime
        free
        ps --no-headers -A -o "%cpu sz ucomm" | sort -k1nr | head -20
        echo "#############################"
        sleep 5
done
--8<--

chmod 755 /tmp/monit_top.sh


and modify monit configuration like this:

--8<--
  check system TamTam
       if loadavg (1min) > 4 then alert
       if loadavg (5min) > 2 then  then alert
       if memory usage > 75% then alert
       if cpu usage (user) > 70% then exec "/tmp/monit_top.sh" else  
if recovered then exec "/bin/bash -c 'kill `cat /tmp/monit_top.pid` &&  
cat /tmp/monit_top.out | mail -s 'cpu usage alert' address@hidden'"
       if cpu usage (system) > 30% then alert
       if cpu usage (wait) > 20% then alert
--8<--

Basically when the cpu usage goes high, the script which collects the  
resource usage information and TOP20 processes each 5 seconds is  
started. When the cpu usage lowered, the script is stopped and output  
mailed to address@hidden

You can modify the script as you want - collect additional  
informations, modify the sleep time, etc.


Martin




On May 18, 2009, at 10:06 AM, Pascal Legrand wrote:

> Hello,
> i've got a problem with monit, i configure it to alert me when cpu  
> usage is too important, and i've got this mail :
>
> Resource limit matched Service Intranet
>         Date:        Mon, 18 May 2009 04:13:24 +0200
>         Action:      alert
>         Host:        tamtam
> 	Description: 'Intranet' cpu user usage of 70.4% matches resource  
> limit [cpu user usage>70.0%]
>
> Resource limit matched Service Intranet
>         Date:        Mon, 18 May 2009 04:13:25 +0200
>         Action:      alert
>         Host:        tamtam
> 	Description: 'Intranet' loadavg(5min) of 2.2 matches resource limit  
> [loadavg(5min)>2.0]
>
> But i cant see in logs what happen.
> is it a bug of monit ?
> here is some informations about my server
>
> thank you for your help
>
>
>
> Debian Lenny
> ------------------------------------------------------
> Paquet : monit
> État: installé
> Automatiquement installé: non
> Version : 1:4.10.1-4
> ------------------------------------------------------
> cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 8
> model name      : Pentium III (Coppermine)
> stepping        : 3
> cpu MHz         : 697.898
> cache size      : 256 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge  
> mca cmov pat pse36 mmx fxsr sse up
> bogomips        : 1397.51
> clflush size    : 32
> power management:
> ------------------------------------------------------
> Configuration de monit
>
> set daemon  60
> set logfile syslog facility log_daemon
> set mailserver smtp.bla.fr
> set mail-format { from: address@hidden }
> set alert address@hidden
> set httpd port 2812 and
> allow admin:test
>
> # System
> check system TamTam
> if loadavg (1min) > 4 then alert
> if loadavg (5min) > 2 then alert
> if memory usage > 75% then alert
> if cpu usage (user) > 70% then alert
> if cpu usage (system) > 30% then alert
> if cpu usage (wait) > 20% then alert
>
> # Disk
> check device root-hda1  with path /dev/hda1
> if space usage > 85% then alert
> check device home-hda9  with path /dev/hda9
> if space usage > 85% then alert
> check device tmp-hda8  with path /dev/hda8
> if space usage > 85% then alert
> check device usr-hda5  with path /dev/hda5
> if space usage > 85% then alert
> check device var-hda6  with path /dev/hda6
> if space usage > 85% then alert
>
> #Surveillance de ssh
> check process sshd with pidfile /var/run/sshd.pid
> start program  "/etc/init.d/ssh start"
> stop program  "/etc/init.d/ssh stop"
> if failed port 22 protocol ssh then alert
>
> #dhcpd
> check process dhcpd with pidfile /var/run/dhcpd.pid
> start program  "/etc/init.d/dhcp3-server start"
> stop program  "/etc/init.d/dhcp3-server stop"
> if failed port 67 type udp then alert
>
> #ldap
> check process slapd with pidfile /var/run/slapd/slapd.pid
> start program = "/etc/init.d/slapd start"
> stop program = "/etc/init.d/slapd stop"
> if failed port 389 protocol ldap3 then alert
>
> #Smartd
> check process smartd with pidfile /var/run/smartd.pid
> start program = "/etc/init.d/smartmontools start"
> stop program = "/etc/init.d/smartmontools stop"
> if changed pid then alert
> ------------------------------------------------------
>
>
>
>
>
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